BASIC SENSITOMETRY AND CHARACTERISTICS OF FILM The Essential

BASIC SENSITOMETRY AND CHARACTERISTICS OF FILM The Essential Reference Guide for Filmmakers

THE CHARACTERISTIC CURVE

THE CHARACTERISTIC CURVE Shadows “fall” on the toe.

THE CHARACTERISTIC CURVE Highlights “fall” on the shoulder.

THE CHARACTERISTIC CURVE Midtones “fall” on the straight line.

THE CHARACTERISTIC CURVE

EXPOSURE INDEX AND LATITUDE

EXPOSURE INDEX AND LATITUDE 32 64 125 250 500 40 80 160 320 650 50 100 200 400 800 Yellow numbers show film speeds used on current Kodak Films

EXPOSURE INDEX AND LATITUDE Reciprocity Law Ex. T=H Reciprocity Effect Ex. T≠H (Reciprocity Law Failure)

EXPOSURE INDEX AND LATITUDE

GRAININESS AND GRANULARITY Silver halide crystals in unexposed film Silver particles in exposed film

GRAININESS AND GRANULARITY Subjective sensation = graininess Measurement of grain = granularity

GRAININESS AND GRANULARITY Diffuse rms Granularity Value Granularity Classification 45, 50, 55 Very coarse 33, 36, 39, 42 Coarse 26, 28, 30 Moderately coarse 21, 22, 24 Medium 16, 17, 18, 19, 20 Fine 11, 12, 13, 14, 15 Very fine 6, 7, 8, 9, 10 Extremely fine Less than 5, 5 Micro fine

SHARPNESS AND MTF CURVE

RESOLVING POWER High Contrast Values in lines/mm ISO-RP Classification 50 or below Low 63, 80 Medium 100, 125 High 160, 200 Very High 250, 320, 400, 500 Extremely High 630 or above Ultra High

COLOR SENSITIVITY AND SPECTRAL SENSITIVITY

COLOR SENSITIVITY AND SPECTRAL SENSITIVITY Daylight-balanced film Tungsten-balanced film

SPECTRAL DYE DENSITY

DIMENSIONAL STABILITY Temporary Size Changes • Moisture • Temperature Permanent Size Changes • Age Shrinkage • Curl • Buckling and Fluting

Conclusion QUESTIONS?